Langmuir and Dubinin-Radushkevich analyses on equilibrium adsorption of activated carbon fabrics in aqueous solutions

Chien To Hsieh, Hsisheng Teng

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51 Citations (Scopus)

Abstract

The present study investigated the adsorption of phenol, iodine and tannic acid onto activated carbon fabrics in aqueous solutions. The carbon fabrics were made of polyacrylonitrile with different extents of activation in steam. The increasing extent of activation is accompanied by increasing carbon porosity as well as liquid-phase adsorption capacity. Langmuir and Dubinin-Radushkevich (D-R) models were employed to analyze the equilibrium adsorption data. The fractional filling of carbon micropores and the mean free energy for adsorption were estimated according to these models. It is suggested on the basis of the present work that the mesopore fraction of the fabrics, the extent of carbon activation, and the adsorbate size are important as well as competitive factors determining the adsorption capacity. Both the equilibrium constant and free energy for adsorption increase with the mesopore fraction, indicating that the mesopores promote the adsorption onto high energy sites, whereas the fraction filling micropores decreases with the extent of carbon activation and the size of the adsorbates. (C) 2000 Society of Chemical Industry.

Original languageEnglish
Pages (from-to)1066-1072
Number of pages7
JournalJournal of Chemical Technology and Biotechnology
Volume75
Issue number11
DOIs
Publication statusPublished - 2000 Nov

All Science Journal Classification (ASJC) codes

  • Biotechnology
  • Chemical Engineering(all)
  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Waste Management and Disposal
  • Pollution
  • Organic Chemistry
  • Inorganic Chemistry

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